K9 Bi-concave Glass Lens 28mm And 40mm

Double Concave Glass Lens is composed of two inward, equally curved surfaces. Ideal for beam expansion, light projection, and expanding the focal length of an optical system, the glass materials have many varieties such as K9, Fused Silica and others ,can do kinds of coating on lens surface ,...

Double Concave Glass Lens is composed of two inward, equally curved surfaces. Ideal for beam expansion, light projection, and expanding the focal length of an optical system, the glass materials have many varieties such as K9, Fused Silica and others ,can do kinds of coating on lens surface , any size can be customized , both surface of bi-concave lens are concave structure, it is negative focus length, can be widely used for focusing the light , projector , detection and other fields